Im trying to find all the ways my friend can be freed from stress.?

My best friend Bridget has a bit of an emotional issue, and im scared to death of how she will end up. Me and her have been unseperabe since 4th grade and she was all happy happy, never got angry at anyone and was a cheerleader and stuff, until Her parents divorced right before she was in 8th grade. But since the day she was born she has witnesed her dad beat her mom, ALL THE TIME. Her mom would have blood all over her face, her lip busted and all of that. Ive witnessed it as well, but i know it really effected my friend. When her parents divorced Bridget, her sister Shelby and her mom Cat started back at square one. They had zero money what-so-ever because of the fact her mom didnt want a job and couldnt really get a reall one because she was a high school drop out. The 3 of them moved into an abuse shelter. They all got along because life for them was good that they finally got away from her father. A few months later Cat got on section-8 housing, food stamps and used Shelbys disability check to pay for her own car payment and her cell phone payment ect. Cat didnt use Shelbys check for her daughter, she used it for her own enjoyment. Well as soon as they started living on food stamps, Cat started sleeping around with multipul men. And when i say multipul i mean, MULTIPUL. Trust me, ive witnessed it. Cat would leave about 6 at night and go to bars with her friends that were 20 years younger than her and would come home at 3 in the morning with a new guy, while she had a boyfriend that was at his house or whereever, so Cat cheated on them. Cat soon got 'too tired' to take Bridget to school, since the school she went to was 2 cities over Bridget was late for school atleast twice a week. And every other week she would miss a day of school because of her. This is what really upset Bridget. While Bridget would tell her mom how this upset her, with the guys and school, Cat would get so angry and start the biggest fights ever, that usually ended up with her mom hitting her in the face. She didnt wanna hear the truth. This is when Bridget started to change. She got angry very easily, and she HATED everyone. She was always stressed. She was no longer the happy Bridget i knew, she hated everything and everyone, didnt care about anything or anybody, her grades dropped and turned to alcohol and she would always steal. Fights got horrible between them over 3 months. They again moved into a new place and Cats partying and cheating habits died. They still continued to argue but this time even worse. They started fighting over little things. For example, one time I was there it was 6 in the morning and we were sleeping and her mom busted in her room demanding her to braid her hair. Bridget said no once, and her mom hauled off and BASHED Bridget in the face. Her mom always hit Bridget in the face. Here lately evets like that have started getting worse. Today, Cat asked Bridget to go in with her to chipotle so she could get something to eat and not bridget, so bridget said no. Cat then again beat her face but this time even worse splitting her lip open saying she was unruly. Just now Bridget came over balling her eyes out saying her mom wont stop hitting her. Never before in my whole entire life have i seen bridget cry. Not when her grandma died, nothing. This is how i know it has really gotten bad. This whole year bridget has done nothing but hold in all her sadness and anger towards her mom and everybody. She let alllll of it out when she came to my house today. I was scared for her life. I was shaking and in shock, i didnt know what to do i just looked at her listening to everything she had to say. Her mom busted in my house and demanded Bridget to get in her car. She went with her and my dad looked up child services' number and told me to give it to her for her to call if it ever happeneds again. I dont know what to do. Bridget needs emotional help, and away from her mom. What can i do to help her? What are her legal rights to get away from her mom?